Which of the Following Statements Is False Concerning Mental Retardation

Which of the following statements is false concerning mental retardation?

A) An IQ score between 50 and 70 characterizes mild mental retardation
B) Moderate mental retardation is typically associated with significant delays in language development such as using only 4 to 10 words by the age of three years
C) Severe mental retardation includes significant delays in motor development an IQ score between 10 and 20.
D) An IQ score less than 20 characterizes profound mental retardation and the individual requires full-time custodial care